Finding the Third Proportional to 638.63 and 976.31

Step by Step Solution

1. Step 1: Write the proportion equation
   638.63 : 976.31 = 976.31 : x
2. Step 2: Convert to fraction form
   638.63/976.31 = 976.31/x
3. Step 3: Cross multiply
   638.63x = 976.31 × 976.31
4. Step 4: Simplify right side
   638.63x = 953,186.10
5. Step 5: Solve for x
   x = 953,186.10/638.63
6. Step 6: Final answer
   x = 1,492.56